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Accounts and Other Receivables - Summary of Changes in Loss Allowance of Accounts and Other Receivables (Details) - Loss allowance - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounts receivable |  |  |
Trade And Other Receivables [Line Items] |  |  |
Financial assets at amortised cost beginning balance | ₩ 626 | ₩ 319 | ₩ 689
Bad debt expenses | 589 | 1,402 | 701
Reversal of allowance for doubtful accounts | 0 | 0 | 0
Write-off | (665) | (1,095) | (1,071)
Financial assets at amortised cost ending balance | 550 | 626 | 319
Other receivables |  |  |
Trade And Other Receivables [Line Items] |  |  |
Financial assets at amortised cost beginning balance | 5 | 5 | 5
Bad debt expenses | 0 | 0 | 0
Reversal of allowance for doubtful accounts | 0 | 0 | 0
Write-off | 0 | 0 | 0
Financial assets at amortised cost ending balance | ₩ 5 | ₩ 5 | ₩ 5

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